Operations are not allowed… here is a solution to the problem.
Operations are not allowed
I want to run some commands in a python script
import fcntl
KDSETLED = 0x4B32
SCR_LED = 0x01
console_fd = os.open('/dev/console', os. O_NOCTTY)
fcntl.ioctl(console_fd, KDSETLED, SCR_LED)
I’ve set a+rw
for /dev/console
, but when I run the script from a normal user:
fcntl.ioctl(console_fd, KDSETLED,
SCR_LED) IOError: [Errno 1] Operation
not permitted
What should I do if I need to run the script from a regular user?
Solution
I believe you need to use CAP_SYS_TTY_CONFIG
to execute your script. Or (if you’re running on a console), using your control tty (e.g., /dev/tty1
) instead of /dev/console
might work.
The kernel code to do this appears to be drivers/tty/vt/vt_ioctl.c:
/*
* To have permissions to do most of the vt ioctls, we either have
* to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
*/
perm = 0;
if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
perm = 1;
⋮
case KDSETLED:
if (!perm)
goto eperm;
setledstate(kbd, arg);
break;
So, it looks like these are definitely your two options.